CN1756118A - Outer loop power control in a communication system - Google Patents

Abstract

The invention relates to the out-loop power control in a communication system, and the out-loop power control of a business channel includes using at least one output coming from the other business channel to determine proper control threshold values, when selected channel situations such as the SNR exist. An example business channel situation includes that no enough data transmission provides the direct measurement of the packet error rate, and another example business channel situation which is used for determining when to use other channel outputs is a transmission mode on the channel. An example output is the ratio of the energy and the noise of a code chip of a pilot channel which is interrelated with the channel.

Description

Exterior ring power control in the communication system

Technical field

The present invention relates generally to field of telecommunications.

Background technology

Communication system can be based on hard wire connection, transmission of wireless signals or the combination of these two.Some systems can handle Speech Communication.Some can handle data communication.Some can handle the communication (being voice-and-data) of an above type.

In data communication system, information bit is combined into a frame or a packet format usually and is launched into receiver.Mistake may be lost or be comprised to the grouping that for example receives owing to one is used to launch the noisy communication channel of data.Packet error rate (PER) is the percentage that comprises the reception grouping of mistake.

Known system by the counting during a time interval lose or the erroneous packet number is directly determined PER.In many situations, use direct counting technique to determine that fully PER is impossible.In many data transmission devices, being transmitted in is not continuous on the channel.Transfer of data is for example tended to burst.During the dead time that does not receive packet, the good counting of nothing and basis that be not used in definite PER.

Direct count determines that it is that PER in reality is when very little that PER may not provide another situation of reliable results.For example, PER may be about 10 ^-4Or 10 ^-5Magnitude.In a limited time interval, receive grouping number not even as big as providing enough information to be used for accurately determining PER.

PER is important measuring of indication channel quality and systematic function.PER can be by adjusting signal to noise ratio (SIR), introduce redundancy or controlling the generation of mistake so that minimizing is divided into groups simultaneously by these two methods.Known system is designed to attempt keeping PER to be lower than a selected target.Have one to trade off between service quality and signal transmission power, it influences the selection of PER target in typical case.Exterior ring power control is used to select suitable threshold value or SIR so that a suitable balance between arrival service quality and the transmitting power.

Forward error correction (FEC) and automatic re-send request may (ARQ) are the traditional error protection schemes in the communication system.At the transmitter place, encoder increases redundancy and protects information bit with the form of parity check bit.At the receiver place, the decoder research redundancy therefore mistake of a certain quantity can be repaired.Each interface of a kind of system of coding can be tolerated more multichannel mistake, and therefore can bear in lower transmitting power operation and in higher data speed and launch.For ARQ, transmitter sends grouping to receiver.Whether receiver has mistake once receiving the grouping checked for errors so that determine grouping.Whether receiver sends an affirmation and returns to transmitter, indicate this grouping to be successfully received.If this grouping is not correctly received, the then same grouping of transmitter retransmits.Otherwise transmitter is deleted this grouping and is handled next grouping from its buffer.

Also have the combination of a kind of FEC and ARQ technology, it is considered to hybrid ARQ (HARQ) scheme.The redundancy that known two kinds of specific technology: Chase merge and increase progressively in HARQ.With low rate FEC sign indicating number coding original data packet.Coding groups is divided into a plurality of son groupings then.Each son grouping is used as unit of transfer.In Chase merged, each son grouping was identical with the grouping of original coding.Have a mistake as fruit grouping is decoded, then the next son grouping is launched.At the receiver place, a plurality of son groupings that receive are merged and decoding by best.For the redundancy that increases progressively, each son grouping is different and have the redundancy information of initial packet.If the first son grouping is decoded improperly, then the next son grouping is launched.At the receiver place, a plurality of son groupings that receive are joined together and form a code word that is used to decode.In a transmission, use more sons be grouped in the receiver place cause one have multi-redundant information more than long code word.Therefore, the transmission of each in the redundancy technics that increases progressively provides additional redundancy information for higher error correction capability.

In wireless communication system, convolution code and turbo sign indicating number are used the sign indicating number as FEC usually.

PER in the coded system depends on ratio (Eb/No), FEC encoding rate, ARQ scheme and the grouping dimension of bit energy and noise spectrum density.Be difficult in the decode error probability analysis of convolution code and turbo sign indicating number calculate.Replace obtaining accurate error probability, typically, derive a boundary and reflect a rational decoding performance rank.For the purpose of discussing, the transfer of data on the Traffic Channel uses radio communication to take place in one example.An example system with this ability is the IxEV-DV system, and it is the third generation CDMA2000 standard of 3GPP2 definition.

Dispose a plurality of channels on the reverse link in the IxEV-DV system.The high speed data channels that is used to launch customer service is reverse link packet data channel (R-PDCH).Typically, the transmission time unit on this channel is called as a time slot and usually has duration of 10 milliseconds.Encoder packet with FEC sign indicating number coding is divided into the son grouping.Each son grouping is predefined in the time slot and is launched.Various encoder packet size is arranged here.Known Turbo code is used the FEC sign indicating number as PDCH.Known convolution code is used to traditional 3G1x Traffic Channel, as basic channel (FCH) and auxiliary channel (SCH).Typically, the transmission rate on R-PDCH changes up to 1.8MBPS and according to the data available of channel status and mobile radio station from 6.4KBPS and dynamically is provided with.Different transmission rates on the R-PDCH is the result of different transmitter sizes and modulation scheme.

In one example, hybrid ARQ is used in and carries out time diversity and error performance improvement on the R-PDCH.

Reserve link pilot channel (R-PICH) is used to send continuously pilot frequency sequence.Pilot frequency sequence is the unmodulated known signal sequence such as a plurality of binary numbers.In the CDMA spread spectrum system, pilot signal is used to determine the multipath component characteristic and helps the coherent demodulation of received signal.Transmitting power on the pilot channel for example is used the reference point as other channel.R-PDCH for example has a constant offset on the transmitting power of pilot channel, be commonly called T2P (business and pilot tone) ratio.

For example in a cdma system, it is desirable that the PER of maintenance Traffic Channel is lower than some targets.In one example, 1% PER keeps a rational user data services quality.Adjust the control that professional SIR keeps PER.For example when PER is too high, target SIR will be increased.For example when PER is too low, target SIR will be lowered so that reduce the interference that is produced by a specific mobile radio station.Adjust target SIR and be called as exterior ring power control sometimes so that keep PER to be lower than a target door limit value.The transmitting power of mobile radio station is regulated in inner loop power control according to target SIR.Interior ring and exterior ring power control operation simultaneously are so that reach a good systematic function.The power control section of base station divides 22 to be responsible for exterior ring power control.

The PER value is an example parameter that is used for exterior ring power control.In some cases, the direct measurement that reaches the PER on PDCH (being Traffic Channel) is possible., have such the time, the power control section branch of wherein do not divide into groups available and base station can not directly be measured PER.Under such situation, exterior ring power control may be sacrificed.

An other consideration is: four different modes of the promising different application design of the R-PDCH among the IxEV-DV.For example, promote (boost) pattern be for the application of delay-sensitive designed.In the lifting pattern, grouping sends with a power higher than the power setting of normal mode.This has improved the probability of success of emission for the first time and has reduced retransmission delay.As a result, the PER after HRAQ merges is very little usually in the lifting pattern.For example it can be less than .1%.Under such situation, even but also be difficult to directly calculate PER as receiving the grouping time spent.

Summary of the invention

Even the invention solves when the Traffic Channel situation so so that the needs that keep exterior ring power to control when the technology of exploitation can not provide satisfied or reliable results in the past.

A kind of exemplary communication method comprises: when having one first Traffic Channel situation, determine the exterior ring power control gate limit value of Traffic Channel based at least one selected output of at least one other channel.

In one example, the first Traffic Channel situation is included in the volume of transmitted data that is lower than selected threshold value on the Traffic Channel, perhaps at least one in the emission mode except normal mode on Traffic Channel.

In one example, other channel is the pilot channel relevant with Traffic Channel.The basis of the packet error rate of estimating Traffic Channel is provided from least one output in the pilot channel.The packet error rate of estimating is provided for determining how to be provided with the basis of exterior ring power control gate limit value.

An example comprises when the second different Traffic Channel situations exists, and uses the selected output from Traffic Channel.In one example, the packet error rate of Traffic Channel is determined and is used to be provided with exterior ring power control gate limit value.Whether first or second situation of determining Traffic Channel exists to allow to select to be used to be provided with the suitable basic of threshold value.

Various characteristics of the present invention and advantage will become apparent those skilled in the art from following detailed description.Follow the accompanying drawing of detail specifications briefly to describe by following quilt.

Description of drawings

Fig. 1 schematically illustrates the selected part that is used for exterior ring power control in an example communication system.

Fig. 2 is the flow chart that an exemplary method of exterior ring power control gate limit value is determined in general introduction.

Fig. 3 is the flow chart that an exemplary method estimating the Traffic Channel packet error rate is shown.

Embodiment

Fig. 1 schematically shows the selected part of a communication system 20.In this example, an exterior ring power control section 22 is the parts that are used for the radio network controller of RFDC, and it is arranged on the threshold value that reaches targeted packets error rate (PER) on the Traffic Channel.An example threshold value comprises signal to noise ratio (SIR).Mobile radio station use known technology is signal to noise ratio and threshold value compares and responsively regulate transmitting power with a kind of known way.Shown example comprises the unique method that threshold value is set.

Receiver section 24 R-PDCH receive packet with a kind of known way on Traffic Channel.Receiver section 24 is handled with a kind of known way and is received grouping, comprises detecting whether any one comprises mistake in the grouping.Error event information is provided for power control section and divides 22.

Shown example comprises two Traffic Channel mode detector parts 26 and 28.Any one can both provide about the information of the transmission mode on the Traffic Channel PDCH divides 22 to power control section.The example transmissions pattern comprises normal mode and lifting pattern, and wherein each all has different average transmission numbers for a grouping.Mode detector part 28 is to be designed to be used for the part of ASIC of Base-Band Processing and the data on the decoding Traffic Channel PDCH so that determine transmission mode with a kind of known way in this example.Schematically illustrated detector portion 26 uses the packet arrival rate to determine transmission mode.

In one example, detector portion 26 is obtained each and is received grouped time stamps and determine time between arriving of grouping that order receives (that is, mutual the time of advent).Detector portion 26 is used the average transmission number of determining of estimating each grouping the mutual time of advent.Approaching approximately for the moment when each transmission packets number, detector portion 26 determines that the traffic channel transmission patterns are likely so-called lifting pattern.This follows the use of the more high transmit power from the lifting pattern, and it has increased the possibility that successfully receives grouping in first transmission.Compare with normal mode, in the lifting pattern on an average grouping repeat transmit lessly, wherein use less transmitting power.If the average transmission number of each grouping is near most probable number MPN, then the data flow on the Traffic Channel PDCH is in normal or normal mode probably.

Shown example also has a receiver section 32R-PICH, and it receives reverse link pilot channel PICH transmission.Receiver section 32 detects and handles pilot frequency code element with a kind of known way.The selected output of at least one of pilot channel PICH is identified at receiver section 32 places.In one example, each chip energy of pilot channel is output and the packet error rate of selecting that is used for the estimation of definite Traffic Channel PDCH as described below with the ratio of noise spectrum density.

The information of using channel quality indicator receiver section 32 R-CQICH and Doppler's estimating part 34 to determine about mobile radio station.In one example, use the Doppler frequency that CQI information is estimated the process of declining with a kind of known way, it provides the indication of mobile radio station translational speed.

Estimator part 40 is determined to be provided for power control section and is divided an estimation PER of 22.In this example, the PER of estimation is at least based on the selected output of pilot channel PICH with from the Doppler frequency of the estimation in the estimating part 36.Even if under the situation when on Traffic Channel PDCH, not having enough transfer of data, use pilot channel PICH to export to estimate the PER of the Traffic Channel PDCH that is used for transfer of data to enable power control section and divide 22 a suitable exterior ring power control gate limit value is set with direct measure of enabling Traffic Channel PER.

Fig. 2 comprises the flow process Figure 50 that has summarized a method, and this method is used the exterior ring power control gate limit value that is used for determining a Traffic Channel such as the Traffic Channel that is used for transfer of data from least one output of another channel.This diagrammatic sketch comprises the functions of being divided 22 execution by power control section.

Example flow starts from 52, and at this, target SIR is set up.Step 52 also comprises the outer shroud control time interval that an expectation is set, and analyzes data for the purpose that power control gate limit value is set during the interbody spacer at this moment.In one example, this time interval is obviously longer than a time slot of each packet.This in time interval at least long enough so that usefully ensue the time cycle and go up a suitable threshold value of using and carry out significantly determining about being arranged on.What restriction the those skilled in the art that benefit from this specification will understand will turn round best to meet the needs of their particular condition.

54, for example provide the indication of the data volume of launching on the inherent Traffic Channel in interval seclected time from the available traffic channel PDCH information of receiver section 24.56, from being used to determine about this type of information in the information of Traffic Channel PDCH whether any transfer of data has taken place and received grouping number whether enough be used for directly determining power control gate limit value.If enough reception grouping numbers are arranged, then analyze the transmission mode information 58 that obtains from one of mode detector part 26 or 28 at 60 places.If transmission mode is standard or normal mode, then flow process is used for the pattern continuation (that is, the SIR threshold value being set) of the traffic channel information of definite exterior ring power control gate limit value with a kind of direct consideration.

62, power control section divides 22 to determine whether any grouping mistake.64, power control section is divided the 22 grouping number of errors of determining on 52 interim in the outer shroud control time Traffic Channel PDCH that are provided with.

With a kind of known way select time at interval in (that is packet error rate (PER)) suitable grouping number of errors to meet the needs of particular condition.Suitable number is considered to the error threshold value in this example.66, grouping number of errors and the error threshold value determined compare.

If the grouping number of errors surpasses the error threshold value, then increase power control gate limit value (being target SIR) 68.Those skilled in the art that such increment depends on the needs of particular condition and benefits from this will use suitable increment.If the grouping number of errors is less than the error threshold value, then power control gate limit value reduces with a kind of known way.

This flow process repeats to start from 72 for next exterior ring power control interval.

If the Traffic Channel situation is so that then power control section divides 22 to use another operator schemes so that the direct measurement of the packet error rate on Traffic Channel PDCH is impossible or unreliable for power control gate limit value is set.In this example, power control section divides at least one selected output of using at least one other channel to be used for determining exterior ring power control gate limit value.For example, when do not have in the judgement at 56 places indication enough reception grouping numbers be used for direct count they when determining PER, flow process proceeds to the steps of 76 expressions.In one example, each control time at least one grouping of interval is considered to enough.The those skilled in the art that benefit from this specification can select the grouping of proper number to provide a significant PER counting to meet the needs of their particular condition.

Alternately, when the transmission mode on the Traffic Channel PDCH is lifting pattern or another pattern except normal mode, replace step 62, flow process proceeds to step 76.

76, power control section divides 22 to enter a pattern, and this pattern comprises: use by the estimation Control Parameter of estimator part 40 based on this definite Traffic Channel of the output of another channel.In one example, estimator part 40 uses the PER of pilot channel PICH to determine the equivalent PER of Traffic Channel PDCH.That equivalence or the PER that estimates are provided at 78 places.

80, the power control section branch compares PER that estimate or equivalence and target numbers PER so that determine effectively how much grouping has mistake.If the grouping number of determining at 82 places that mistake is arranged exceeds the counting threshold value, then exterior ring power control gate limit value increases at 68 places.If the grouping number of determining that mistake is arranged is lower than the counting threshold value, then power control gate limit value reduces at 70 places.

Shown example is used at least one in the example modes that power control gate limit value is set.When existing corresponding to the first Traffic Channel situation that can not look to directly considering traffic channel information, power control section divides 22 can use a kind of like this operator scheme, and this operator scheme comprises: according to estimating Traffic Channel output from one in another channel such as pilot channel PICH corresponding output.In one example, two patterns all are used simultaneously.In such example, be used as a kind of of information reliability who from Traffic Channel PDCH, directly obtains based on the PER of the estimation of pilot channel output and examine.

In this, it is of value to the output of consider using from another channel except that Traffic Channel PDCH and is used for definite equivalent Traffic Channel PER.

The decode error probability of convolution code or Turbo code is the function of specific encoding rate, code word size and channel bit error rate (Pb).The channel bit error rate is bit energy and the ratio (Eb/No) of noise spectrum density and the function of modulation scheme.For described special code and modulation scheme, decode error probability P e can be expressed as the function of Eb/No:

For convolution code,

P _e＝f ₁(E _b/N ₀) (1)

Perhaps, for Turbo code

P _e＝f ₁′(E _b/N ₀) (2)。

Perhaps Pe can be expressed as the function of Pb:

For convolution code,

P _e＝f ₂(P _b) (3)

Perhaps for Turbo code

P _e＝f ₂′(P _b) (4)。

In fact be difficult to analyze and obtain the approaching formal solution of decode error probability.On the contrary, typically, a upper limit is used to represent the performance of convolution code or Turbo code.The upper limit about Pe in awgn channel is studied.Specification relies on the upper limit of knowing of awgn channel and uses expansion to comprise the channel of variation At All Other Times and the result of HARQ.

Wireless fading channel is time dependent.Power control is intended to track channel change and the received signal intensity of fluctuation around target SIR.In addition, because HARQ receives grouping by forming at the son of different time emission.All of these factors taken together causes that the Eb/No or the bit error rate (Pb) that receive grouping change.The analysis border of knowing of the Pe of awgn channel is no longer suitable in this scheme.

Deriving the border when therefore, being included in the Eb/No that consider to change or Pb situation is useful in the interior expansion to analyzing.The Eb/No of the equivalence in awgn channel is used in the example.Suppose that for a certain code word and modulation scheme Pe is the Eb/No that changes or the function of Pb, it is represented by a L n dimensional vector n,

$P_e=g_1\left(\stackrel{\‾}{(E_b/N_0)}\right)\·\·\·\left(5\right)$

Or

$P_e=g_2\left(\stackrel{\‾}{P_b}\right)\·\·\·\left(6\right)$

For awgn channel, Pe is by equation (1) or (2) expression.The Eb/No or the Pb of equivalence are defined as:

$P_e=f_1\left({(E_b/N_0)}_{\mathrm{equ}}\right)=g_1\left(\stackrel{\‾}{(E_b/N_0)}\right){(E_b/N_0)}_{\mathrm{equ}}@f_1^{-1}\left(g_1\left(\stackrel{\‾}{(E_b/N_0)}\right)\right)\·\·\·\left(7\right)$

Or

$P_e=f_2\left({\left(P_b\right)}_{\mathrm{equ}}\right)=g_2\left(\stackrel{\‾}{P_b}\right){\left(P_b\right)}_{\mathrm{equ}}@f_2^{-1}\left(g_2\left(\stackrel{\‾}{P_b}\right)\right)\·\·\·\left(8\right)$

In other words, the Eb/No (or Pb) of equivalence is an equivalent constant value in the awgn channel, and it generates and the identical Pe of Eb/No (or Pb) value that changes.The analysis of the Pe of the Eb/No of this variation (or Pb) is converted to equivalent Eb/No or the task of Pb of finding.

Because the analysis of convolution code and Turbo code is different, so consider respectively that correspondingly the function of the Pe of two type codes of calculating is useful.

For convolution code, the function that calculates equivalent Pb or Eb/No is represented as:

${(E_b/N_0)}_{\mathrm{equ}\_\mathrm{cov}}=h_1\left(\stackrel{\&OverBar;}{E_b/{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="A20051010719000171.png"\; state="\{\{state\}\}">N</figure-callout>}}_0}\right)\&CenterDot;\&CenterDot;\&CenterDot;\left(9\right)$

Or

${\left(P_b\right)}_{\mathrm{equ}\_\mathrm{cov}}=h_2\left(\stackrel{\&OverBar;}{P_b}\right)\&CenterDot;\&CenterDot;\&CenterDot;\left(10\right)$

For Turbo code, the function that calculates equivalent Eb/No or Pb is represented as:

${(E_b/N_0)}_{\mathrm{equ}\_\mathrm{turqo}}={{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="A20051010719000171.png"\; state="\{\{state\}\}">h</figure-callout>}}_1}^{\&prime;}\left(\stackrel{\&OverBar;}{E_b/{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="A20051010719000171.png"\; state="\{\{state\}\}">N</figure-callout>}}_0}\right)\&CenterDot;\&CenterDot;\&CenterDot;\left(11\right)$

Or

${\left(P_b\right)}_{\mathrm{equ}\_\mathrm{turbo}}={h_2}^{\&prime;}\left(\stackrel{\&OverBar;}{P_b}\right)\&CenterDot;\&CenterDot;\&CenterDot;\left(12\right)$

In one example, determine to receive relation between the PER of pilot frequency code element and Traffic Channel according to the ratio of each chip energy of pilot channel and noise spectrum density.Referring to Fig. 3, flow process Figure 140 has summarized this exemplary method.Detect pilot channel sequence at 142 places.Use known technology can distinguish from pilot channel that each average chip energy and noise spectrum density on a time slot is than (Ec/Nt).In this example, average Ec/Nt is the pilot channel output of selecting, the basis that it provides Traffic Channel PER to estimate.

Determine the average Ec/Nt on a time slot index i at 144 places.146, store the average Ec/Nt of K time slot, be the maximum transmitted number that allows a grouping at this K=4*N and N.An example comprises that using HARQ and N is the packet retransmission number.

148, estimate that Traffic Channel PER starts from the i time slot, packet ID j=0 wherein, j represent the sequence number of the grouping that receives.In having the example of repeating transmission, be not constant each mutual time of advent of dividing into groups.150, estimator part 40 reads N the value of Ec/Nt.152, the N of an Ec/Nt value is converted into the corresponding Ec/Nt on the Traffic Channel.In one example, the ratio of the Walsh sign indicating number flare factor of the reverse link (R-PDCH) of the Walsh sign indicating number flare factor of pilot channel (PICH) and business or Packet Data Channel is W.In Fig. 3 152, can use following equation to finish conversion:

(E _c/N _i) ^PDCH＝W(E _c/N _i) ^PICH (13)

In one example, each encoder packet has a maximum transmitted number N.After reaching the maximum transmitted number, an encoder packet will be declared wrong.A coding groups is made up of N son in one example.Step 152 in this example in Fig. 3 comprises that one of formation has the vector expression of the Ec/Nt of N dimension, and wherein, each element (Ec/Nt) n represents the Ec/Nt of n son grouping.Suppose at the i time slot, reached the maximum transmitted number of a specific cluster, then N the value of the vector Ec/Nt of this grouping can be expressed as:

${(E_c/N_t)}_n^{\mathrm{PDCH}}=W{(E_c/N_t)}_{j-(N-n-1)*4}^{\mathrm{PICH}},n=0,K,N-1\&CenterDot;\&CenterDot;\&CenterDot;\left(14\right)$

In this example, (N-n-1) quadruplication is because the repeating transmission of son grouping has fallen behind four time slots than nearest sub-transmitted in packets.

Next, 154, from the Ec/Nt vector, determine the equivalent Eb/No on the Traffic Channel.In an example using convolution code, equation (9) provides the Eb/No of equivalence.In an example using the turbo sign indicating number, equation (11) provides the Eb/No of equivalence.

In the example of using convolution code, the Eb/No of equivalence is used the input parameter as equation (1) then.For the example that comprises the turbo sign indicating number, the Eb/No of equivalence is the input parameter of top equation (2).No matter which kind of situation takes place, as a result on the computing service channel j the grouping Pe.This takes place at 156 places in Fig. 3.The PER of the estimation of Traffic Channel then is the result who finishes aforementioned calculation.

In the example of Fig. 3, the next step 158 is to increase progressively the j value and repeat this flow process again.

Same in the example of Fig. 3, the calculating at 156 places comprises uses a tracing table 160, and it provides Pe in the awgn channel and the relation between the Eb/No for different coding device grouping dimension.Calculating at 156 places also is included in 162 places and uses known Doppler's estimation technique.Described estimation in this example is used to determine suitable adaptation function adjustment at 164 places for the PER that estimates.

In one example, determine adaptation function from one one on cycle preset time PER that directly measures and the experimental analysis that the cycle uses the PER of just described algorithm estimation to compare at one time.Adaptation function is of value to adjustment (if necessary) afterwards then so that make such PER corresponding to direct measurement of the more approaching expectation of PER of estimation.In one example, adaptation function is represented as F (.), and it is based on type of code and different.In such example, Pe can be expressed as:

P _e＝F(f(E _b/N ₀)，c) (15)

Wherein c is a constant and can is adjustable for different schemes.Can adjust c based on the channel condition information such as Doppler frequency, path diversity or the like.Provide this and describe, those skilled in the art can select a suitable adaptation function to satisfy the needs of their particular condition.

Example embodiment provides following advantage: the stability of a system of power system capacity, better link and the improvement that has improved.By under the Traffic Channel situation of wide region more, providing more consistent stable power setting, use and determine that from another channel except Traffic Channel PDCH exterior ring power control gate limit value has strengthened systematic function.

Be exemplary and not restrictive on the aforesaid illustrative in nature.To those variations of the disclosed example that do not depart from essence of the present invention with revise and to become apparent for a person skilled in the art.Can only determine by studying following claim the legal protection scope that the present invention provides.

Claims (10)

1, a kind of communication means comprises:

When having a selected Traffic Channel situation, from least one selected output of at least one other channel, determine the exterior ring power control gate limit value of Traffic Channel.

2, the process of claim 1 wherein: described other channel comprises relevant with Traffic Channel and comprises the pilot channel of determining the packet error rate of Traffic Channel according to the selected output of pilot channel.

3, the method for claim 1, wherein: selected Traffic Channel situation is included in Traffic Channel and is lower than in a selected amount of volume of transmitted data or the transmission mode on Traffic Channel at least one, and wherein transmission mode is lifting pattern or another pattern except the standard transmission pattern.

4, the method for claim 1 comprises: when another different Traffic Channel situation of existence, determine the exterior ring power control gate limit value of Traffic Channel from least one selected output of Traffic Channel.

5, the method for claim 4, wherein: another different Traffic Channel situation comprises and exceeds a selected amount of volume of transmitted data and be the transmission mode of standard transmission pattern on Traffic Channel.

6, the method for claim 1 comprises: determine when the selected Traffic Channel situation that exists by determining the transmission mode on the Traffic Channel.

7, the method for claim 6 comprises: determine that by the time between the arrival of determining the packet that order receives with from the time of determining each transmission packets number determines transmission mode.

8, the method for claim 7 comprises:

When the transmission number of determining during, determine that transmission mode is the normal transmission pattern near maximum; With

When being approximately, the transmission number determines that for the moment transmission mode is the lifting pattern.

9, the method for claim 8, wherein: Traffic Channel situation selected when transmission mode is the lifting pattern exists.

10, the method for claim 1 comprises: by determining during the selected time interval that the volume of transmitted data on the Traffic Channel determines when the selected Traffic Channel situation that exists.

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